On-Water Synthesis of 2-Substituted Quinolines from 2-Aminochalcones Using Benzylamine as the Nucleophilic Catalyst
作者:So Young Lee、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b01675
日期:2018.11.2
On-water synthesis of 2-substituted quinolines from 2-aminochalcone derivatives was developed using benzylamine as the nucleophilic catalyst. Various 2-aminochalcones could be applied to this protocol, and the desired 2-substituted quinoline products were isolated in excellent yields by simple filtration. Furthermore, we elucidated the role of benzylamine in this transformation and provided the detailed
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‐Butoxide‐Mediated Synthesis of 3,4′‐Biquinolines from 2‐Aminochalcones
作者:Jiye Jeon、So Young Lee、Cheol‐Hong Cheon
DOI:10.1002/adsc.201900029
日期:2019.5.14
protocol to synthesize 3,4’‐biquinolinesfrom2‐aminochalcones in the presence of a stoichiometric amount of sodium tert‐butoxide as the nucleophilic promotor was developed. Conjugate addition of tert‐butoxide to 2‐aminochalcones provided the corresponding enolates, which underwent Michael addition to another molecule of 2‐aminochalcone to afford a dimeric species of 2‐aminochalcones. Subsequent cyclization
Cu(I)-Catalyzed and Base-Promoted [5 + 2 + 1] Cascade Cyclization of 2-Nitrochalcones with Aliphatic Primary Amines to 5<i>H</i>-Pyrimido[5,4-<i>b</i>]indole Frameworks
An unprecedented [5 + 2 + 1] cascadecyclization to the preparation of 5H-pyrimido[5,4-b]indole derivatives has been disclosed. The novel protocol of 2-nitrochalcones reacted with aliphatic primary amines catalyzed by CuI and promoted by Cs2CO3, which underwent a critical intermediate 2,3-disubstituted indole, providing structurally diverse 5H-pyrimido[5,4-b]indoles in generally high yields (77–90%)
已经公开了一种前所未有的 [5 + 2 + 1] 级联环化制备 5 H-嘧啶并[5,4- b ]吲哚衍生物。2-硝基查尔酮的新方案与由 CuI 催化并由 Cs 2 CO 3促进的脂肪族伯胺反应,其经历了关键的中间体 2,3-二取代吲哚,提供了结构多样的 5 H-嘧啶并[5,4 - b ]吲哚产率普遍较高(77-90%)和底物范围广泛(34 个例子)。
Silver-catalyzed P-centered anion nucleophilic addition to isocyanide: access to 2-phosphinoyl indoles/indol-3-ols
nucleophilic addition of a P-centered anion to isocyanides and cyclization reaction was developed for the efficient and practical synthesis of a wide range of 2-phosphinoyl indole and indol-3-ol derivatives. Unlike the well-documented synthesis of phosphorus-functionalized heterocycles via a P-centered radical, an anionic reactivityprofile of phosphine oxides is most likely involved in this domino transformation
开发了银催化的以 P 为中心的阴离子与异氰化物的化学选择性级联亲核加成和环化反应,用于有效且实用地合成各种 2-膦酰基吲哚和吲哚-3-醇衍生物。与通过P 中心自由基合成磷官能化杂环不同,氧化膦的阴离子反应性特征很可能参与这种多米诺骨牌转化。
Base‐Catalyzed Domino Isomerization/Oxidant‐Free Dehydrogenative Annulation of Allylic Alcohols: Scope, Mechanism, and Application
作者:Xiongyang Zhou、Xun Li、Cheng Le、Jia‐Qi Li
DOI:10.1002/adsc.202400465
日期:2024.8.6
A domino reaction comprising four consecutive steps based on the strategy of isomerization of allylicalcohols was developed. This base‐catalyzed protocol provided an approach for constructing polysubstituted quinolines without additional additives. A wide range of di‐ or trisubstituted γ‐aminoaryl allylicalcohols bearing alkyl or (hetero)aryl substituents were transformed to the structurally diverse